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(No Model.)

H. SGHAUBEL.

FASTENING BOILER TUBES.

No. 405,226. Patented June 11,, 1889..

l vi tmeooco N. PETERS. mmum n m. Wnhinglnfl, a c.

UNITED STATES PATENT OFFICE.

HENRY SOHAUBEL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE- I-IALFTO HENRY NV. MILLER, JR, OF SAME PLACE.

FASTENlNG BOILER-TUBES.

SPECIFICATION forming part of Letters Patent No. 405,226, dated June 11,1889.

Application filed December 21, 1888. Serial No- 294,2'74. (No model.)

To all whom it may concern:

Be it known that I, HENRY SCHAUBEL, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented a new and useful Improvement in Fastening Boiler-Tubes,which improvement is fully set forth in the following specification andaccompanying drawings.

My invention consists of a method of fastening boiler and other. tubesto the sheet thereof, embodying a groove in the wall of the opening ofthe sheet and of a tongue on the tube, said groove and tongue beingformed by swaging the metal, whereby the joint 's tight and reliable andthe strength of the wa l of the opening is not reduced,but, on thecontrary, is strengthened, owing to the swaging operation to which it issubjected.

Figure 1 represents a vertical section of an apparatus employed forforming a groove in the tube-sheet of a boiler, &c., embodying myinvention. Fig. 2 represents a rear View thereof. Fig. 3 represents avertical section 2 5 of an apparatus employed for swagin g a boiler orother tube embodying my invention. Fig. t represents a section of apiece of the tubesheet after being subjected to the action of theapparatus shown in Fig. 1. Fig. 5 repre- 3o sents a section of a pieceof the tube-sheet and of the tube, the latter being swaged to theformer.

Similar letters and numerals of reference indicate corresponding partsin the several 3 5 figures.

Referring to the drawings, A designates an apparatus for grooving thetube receiving openings in the tube-sheet. The same consists of rollersB, (one or more,) having cir- 4o cumferential ribs 1 and fitted freelyin a head or stock 2, through the center of which is longitudinallypassed a tapering or conical plug 3, whereby said rollers 13 may beforced outwardly while resting on the plug as a seat.

The head or stock 2 is provided with the cap 2 which is secured to saidhead by the screws 7, said cap serving to prevent displacement of therollers. The sleeve 8 is secured to the stock 2 by means of the screw 9,and has its sheet.

end abutting against the boiler-plate during the process of grooving.

O designates an apparatus for swaging the tube, the same consisting ofplain rollers D, (one or more,) which are freely fitted in a head orstock 4:, through the center of which is longitudinally passed atapering or conical plug 5, whereby said rollers D may be forcedoutwardly while resting on the plug as a seat. The head 4B is providedwith a cap 4 to retain the rollers in place, and a sleeve 11, forming astop and guide for the tool against the boilersheet during the operationof swaging.

The operation is as follows: The plug 3 is withdrawn sufficiently, sothat the rollers B are permitted to enter the opening in the tube- Theapparatus is then advanced into said opening until the ribs 1 areat orabout the center of the wall of said opening. The plug 3 is now driveninto the stock, the rollers B being thereby forced outwardly, and saidplug is rotated, whereby the ribs 1 cut into said wall and groove thesame. The plug is driven still farther into the stock and again rotateduntil the ribs are cut the required depth, when the plug is withdrawn,the rollers then receding, so that the apparatus may be removed from thesheet. During the grooving operation the rollers B may be guided by theflanges 6 on the ends of the same, said flanges embracing the side ofthe Wall of the opening. The tube having a plain periphery at its end isnow inserted in the grooved opening of the tube-sheet and the apparatus0 in serted into said tube, so that the rollers D occupy a positioncoincident with the groove of the opening of the wall. The plug 5 isthen driven into the stock, the rollers D being thereby forcedoutwardly, and said plug is rotated, whereby the metal of the end of thetube is swaged or formed on its outer periphery with 0 a bead or tonguewhich enters the groove of the tube-sheet. The plug is driven stillfarther into the stock and again rotated until the swag-ing is freelyaccomplished, when the plug is withdrawn, the rollers then receding, sothat the apparatus may be removed from the tube, it being seen that thetube is fastened or connected with the tube-sheet in a.

convenient manner, leaving the interior of the tube ungrooved, the jointbetween the parts being tight and reliably obviating the tendency of thetube to creep and leak. The opening in the tube-sheet will be found tohave its strength unimpaired, the swaging of the groove, 011 thecontrary, strengthening said Walla feature of great importance in boilersheets and tubes fastened thereto.

It is evident that when the tubes of boilers in use are removed they maybe restored or fresh tubes employed, and in either case fastened to thetube-sheet in the manner hereinbefore set forth.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is-

1. In a method of fastening a tube to the sheet thereof, theherein-described method of forming a groove in the Wall of the openingof the tube-sheet, consisting in swaging said Wall to form a groove forreceiving the tongue on the tube, substantially as described.

2. The herein-described method of fastening a tube to the sheet thereof,consisting in swaging a groove in the Wall of the opening of thetube-sheet, inserting a tube into said opening, and then swaging saidtube to form an exterior tongue which enters said swaged groove in. thetube-sheet, substantially as de- 30 scribed.

' HENRY SOIIAUBEL.

Vitnesses:

JOHN A. Wrnnnnsrmnr, JAMES F. KELLY.

